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FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Included in cash and cash equivalents |  |
Amortized Cost | $ 10,285 | $ 18,796
Gross Unrealized Losses |  | (1)
Estimated Fair Value | 10,285 | 18,795
Restricted cash |  |
Amortized Cost | 795 | 794
Estimated Fair Value | 795 | 794
Marketable securities (due in less than 1 year): |  |
Amortized Cost | 52,248 | 73,431
Gross Unrealized Gains | 5 | 48
Gross Unrealized Losses | (19) | (7)
Estimated Fair Value | 52,234 | 73,472
Money market funds |  |
Included in cash and cash equivalents |  |
Amortized Cost | 8,079 | 15,660
Estimated Fair Value | 8,079 | 15,660
Certificates of deposit |  |
Restricted cash |  |
Amortized Cost | 795 | 794
Estimated Fair Value | 795 | 794
Government-sponsored enterprise securities |  |
Marketable securities (due in less than 1 year): |  |
Amortized Cost | 7,369 | 8,618
Gross Unrealized Gains | 1 | 5
Gross Unrealized Losses | (1) |
Estimated Fair Value | 7,369 | 8,623
Commercial paper |  |
Marketable securities (due in less than 1 year): |  |
Amortized Cost | 5,496 | 20,623
Gross Unrealized Gains | 3 | 21
Estimated Fair Value | 5,499 | 20,644
Corporate notes |  |
Included in cash and cash equivalents |  |
Amortized Cost | 2,206 | 3,136
Gross Unrealized Losses |  | (1)
Estimated Fair Value | 2,206 | 3,135
Marketable securities (due in less than 1 year): |  |
Amortized Cost | 39,383 | 44,190
Gross Unrealized Gains | 1 | 22
Gross Unrealized Losses | (18) | (7)
Estimated Fair Value | $ 39,366 | $ 44,205

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